Folder Restructure for OpenQAOA

[shahidee44]

Description

• Restructured folders with OpenQAOA (This is a breaking change!)
• Updated unittests
• Updated example notebooks
• Changed setup.py

Checklist

• I have performed a self-review of my code.
• I have commented my code and used numpy-style docstrings
• I have made corresponding updates to the documentation.
• My changes generate no new warnings
• I have added/updated tests to make sure bugfix/feature works.
• New and existing unit tests pass locally with my changes.

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Name the new unit-tests that you have added along with this change.

test_all.py locally.

[codecov]

Codecov Report

Merging #170 (dcec534) into dev (e9ba397) will increase coverage by 8.22%.
The diff coverage is 100.00%.

❗ Current head dcec534 differs from pull request most recent head 389d57f. Consider uploading reports for the commit 389d57f to get more accurate results

@@            Coverage Diff             @@
##              dev     #170      +/-   ##
==========================================
+ Coverage   81.89%   90.11%   +8.22%     
==========================================
  Files         106       30      -76     
  Lines       12535     5685    -6850     
==========================================
- Hits        10265     5123    -5142     
+ Misses       2270      562    -1708     

Impacted Files	Coverage Δ
tests/test_all.py	100.00% <ø> (ø)
tests/test_analytical_simulator.py	100.00% <ø> (ø)
tests/test_backends.py	52.45% <ø> (+6.40%)	⬆️
tests/test_converters.py	100.00% <ø> (ø)
tests/test_derivative.py	100.00% <ø> (ø)
tests/test_gates.py	100.00% <ø> (ø)
tests/test_imports.py	89.47% <ø> (ø)
tests/test_logger.py	100.00% <ø> (ø)
tests/test_notebooks.py	95.55% <ø> (-0.10%)	⬇️
tests/test_operators.py	100.00% <ø> (ø)
... and 105 more

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